If you like blue,try this backend theme
Html5 Responsive E-Commerce Theme
As its name suggest an elegante theme with nice features and user friendly interface
Keyconcepts Module for eElectronics Shop
Odoo 10.0 community backend theme
An ecommerce theme designed with keeping in mind the pharmacy view but has capablility to be adapted in any line of business
Avira Business Theme
General Purpose Ecommerce Theme, for Eshop !
Minn Business Theme
Sultan Business Theme